Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf58bcce910c0ad…

MALICIOUS

PDF

71.6 KB Created: 2021-03-18 21:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 070dedbac313bd5474f9fcf6b3139580 SHA-1: 28c6790b4f15f1fdba7d3228042bfbe0c9a2c9ae SHA-256: adf58bcce910c0adf76c529d0047bec87a46707c52399e137c5a4f28afca2fa3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file that exhibits characteristics of a link farm, containing numerous external links. One of these links, https://botokaw.ru/wix?keyword=molecular+compounds+worksheet+answers+cf4, is flagged as malicious and associated with phishing and trojan activity by ClamAV. The PDF structure and the presence of embedded URLs suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/wix?keyword=molecular+compounds+worksheet+answers+cf4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409411/normal_6028e1ba94b46.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/0b8491a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_602fb0aac6a61.pdfIn PDF document text
    • http://nejufez.22web.org/unseen_academicals.pdfIn PDF document text
    • https://rawoxozuk.weebly.com/uploads/1/3/2/6/132695352/92121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_602fa582c576c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09a47b09-8144-4a87-a2cd-c462b24dba70/best_financial_modelling_course_in_delhi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ecd482-a7c2-4587-b022-fe9e23fe6d0a/italo_calvino_invisible_cities_review.pdfIn PDF document text
    • http://gukupexokopiwug.epizy.com/lawogufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/678bb7ee-20ba-4a17-be39-e497e3082dec/practicing_the_presence_of_god_audio_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6160aa77-87a9-4ff4-8898-fb5789cc2d4c/58285967752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc234ef1-abde-413b-a7ac-b94dc93e3ccb/danonezowamimirizaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6051c8dd-7c7c-4134-b269-bcb581c24a06/rugiwaruwumi.pdfIn PDF document text
    • http://todabopojexojad.epizy.com/philips_shaver_9000_replacement_head.pdfIn PDF document text
    • http://resifidivef.epizy.com/fukise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f0b2583-3fe8-48c5-a7ec-90c10bdd2842/97767982805.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 5644 bytes
SHA-256: 22e8b5a6b5d08ef61f8402fd1d0cdf4ca79f96e37728448236f806b820a75694
font_01_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 11232 bytes
SHA-256: 0161b8872187eb72707143a3c7157cfd87ac3aa9655e1e9e2ea92296ce02366e

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